request is already moved to ideas section.
also in our feature queue for evaluation.
maximum number of GRE tunnel interface
for your suggestion.
would like to move your request to the ideas section.
We want to start using GRE over ipsec on our sites with old USG1000, that don't support VTI for autodisables routes, and 4 GREs are too small for ours needs.
Will you realize more GRE in the future and will beta FW availble for test?
USG1000 does not support GRE over IPSec.
You can consider for USG1100 or VPN300 which support GRE over IPSec function.